Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual data o richmond jogou como visitante?
 ###Tabelas: CREATE TABLE round_6 (round_6_id AUTO_INCREMENT PRIMARY KEY, Home team VARCHAR, Home team score VARCHAR, Away team VARCHAR, Away team score VARCHAR, Venue VARCHAR, Crowd INT, Date VARCHAR) CREATE TABLE cities_formerly_over_100000_people (cities_formerly_over_100000_people_id AUTO_INCREMENT PRIMARY KEY, City VARCHAR, State VARCHAR, 2010 population VARCHAR, Peak population (year) VARCHAR, Numeric decline from peak population VARCHAR, Percent decline from peak population VARCHAR) CREATE TABLE round_robin_results (round_robin_results_id AUTO_INCREMENT PRIMARY KEY, Team VARCHAR, Wins VARCHAR, Losses VARCHAR, Points VARCHAR, WPct. VARCHAR, G.F. VARCHAR, G.A. VARCHAR, Assists VARCHAR, Penalties VARCHAR, P.I.M. VARCHAR) CREATE TABLE doubles (doubles_id AUTO_INCREMENT PRIMARY KEY, Date VARCHAR, Tournament VARCHAR, Surface VARCHAR, Partner VARCHAR, Opponent in the final VARCHAR, Score VARCHAR) CREATE TABLE passenger_and_express_train_locomotives (passenger_and_express_train_locomotives_id AUTO_INCREMENT PRIMARY KEY, Class VARCHAR, Railway number(s) VARCHAR, Quantity INT, Year(s) of manufacture VARCHAR, Axle arrangement VARCHAR)  
SELECT Date FROM round_6 WHERE Away team = richmond